Silver-Doped Zirconia Nanoparticles as Possible Bactericide in Water Filters

2014 ◽  
Vol 798-799 ◽  
pp. 69-74
Author(s):  
Ermerson Ney Leite Rodrigues ◽  
Edson Jansen Pedrosa Miranda Jr. ◽  
M.M. Oliveira
Keyword(s):  
Bactericidal Activity ◽  
Uv Light ◽  
Colony Growth ◽  
Polymeric Precursor ◽  
X Ray Diffraction ◽  
Precursor Method ◽  
X Ray ◽  
Activity Test ◽  
Water Filters ◽  
Zirconia Nanoparticles

The objectives of this study were to produce ZrO2-based nanoparticles doped with silver, using the polymeric precursor method (Pechini), and to verify their bactericidal activity againstEscherichiacoliandStaphylococcusaureus. Zirconium and silver oxides were chosen due to their bactericidal activity. The oxides were characterized by X-ray diffraction and field emission gun-scanning electron microscopy. The support for the oxides was a porous surface used in gravity filters. The method was not effective against the bacteriumEscherichiacoliin the sample subjected to UV light for 45 min, since it did not eliminate the bacterium, and did not inhibit colony growth and formation. However, the bactericidal activity test proved effective againstStaphylococcusaureus, eliminating the bacterium when the sample was subjected to UV light for 45 min, thus preventing colony growth and formation.

XRD Analysis and Morphological Studies of Spin Coated LiNbO3 Nano Photonic Crystal Prepared for Optical Waveguide Application

2016 ◽  
Vol 1133 ◽  
pp. 457-461 ◽  
Author(s):  
Makram A. Fakhri ◽  
Y. Al-Douri ◽  
Uda Hashim ◽  
Evan T. Salim
Keyword(s):  
Spin Coating ◽  
Xrd Analysis ◽  
Polymeric Precursor Method ◽  
Polymeric Precursor ◽  
X Ray Diffraction ◽  
Precursor Method ◽  
X Ray ◽  
Si Substrates ◽  
Morphological Studies ◽  
Pechini Process

Lithium niobate nanostructured thin films were deposited on (100) N-type Si substrates. Spin coating technique was used employed the polymeric precursor method (Pechini process) . The prepared films were Annealing in static air and oxygen atmosphere was performed at 500 _C for 2 h. X-ray diffraction analysis and SEM properties was carried out for films prepared at different mol concentration (0.25,0.50,0.75,1.00) Mol%. The results show a good enhancement in both structural and surface morphology of the films with increasing the concentration

Synthesis of Gadolinium Doped Ceria Ceramic Powder by Polymeric Precursor Method (Pechini)

2014 ◽  
Vol 798-799 ◽  
pp. 182-188 ◽  
Author(s):  
Jesús Mauricio González Martínez ◽  
Rodrigo Arabey Muñoz Meneses ◽  
Cosme Roberto Moreira da Silva
Keyword(s):  
Ceramic Powder ◽  
Doped Ceria ◽  
Polymeric Precursor ◽  
X Ray Diffraction ◽  
Precursor Method ◽  
Calcination Process ◽  
X Ray ◽  
Before And After ◽  
Fluorite Type ◽  
Gadolinium Doped Ceria

The synthesis by polymeric precursors method (Pechini) was used to acquire gadolinium doped ceria forming Ce0,8Gd0,2O1,9 system, reaching high stoichiometric control features and nanosized particles to form dense solid electrolyte of high ionic conductivity. The synthesis was performed with cerium and gadolinium nitrates hexahydrates, citric acid and ethylene glycol. After the pre-calcination at 250°C/18h a resin was obtained like an expanded foam (puff). According to the iterature, this fact indicates that there is a reduction of agglomerates amount in a ceramic powder. A thermogravimetry-differential thermal analysis evaluated the thermal behavior of the resin. Infrared spectroscopy determined the organic matter and nitrates presence, before and after the calcination process. The X-ray diffraction identified the fluorite-type structure and was determined the crystallite size by the Scherrer equation in 22 and 46 nm for the powder calcined respectively at 600 and 800°C. The scanning electron microscopy evaluated the agglomeration degree and the morphology of the powders.

scholarly journals Effect of Nb on barium titanate prepared from citrate solutions

2002 ◽  
Vol 34 (1) ◽  
pp. 63-71 ◽  
Author(s):  
Biljana Stojanovic ◽  
C.R. Foschini ◽  
M.A. Zaghete ◽  
F.O.S. Vieira ◽  
C.O. Paiva-Santos ◽  
...  
Keyword(s):  
Phase Composition ◽  
Barium Titanate ◽  
Strong Dependence ◽  
Polymeric Precursor Method ◽  
Microstructure Development ◽  
Polymeric Precursor ◽  
X Ray Diffraction ◽  
Precursor Method ◽  
X Ray ◽  
Doped Barium Titanate

The influence of the addition of dopants on the microstructure development and electrical properties of BaTiO3 doped with 0.2, 0.4, 0.6, 0.8 mol% of Nb and 0.01 mol% of Mn based compounds was studied. Doped barium titanate was prepared using the polymeric precursor method from citrate solutions. The powders calcined at 700?C for 4 hours were analysed by infrared (IR) spectroscopy to verify the presence of carbonates, and by X-ray diffraction (XRD) for phase formation. The phase composition, microstructure and dielectric properties show a strong dependence on the amount of added niobium.

scholarly journals Characterization of nickel doped Zn7Sb2O12 spinel phase using Rietveld refinement

2003 ◽  
Vol 18 (3) ◽  
pp. 219-223 ◽  
Author(s):  
L. Gama ◽  
C. O. Paiva-Santos ◽  
C. Vila ◽  
P. N. Lisboa-Filho ◽  
E. Longo
Keyword(s):  
Crystal Structure ◽  
Rietveld Refinement ◽  
Spinel Phase ◽  
Pechini Method ◽  
Polymeric Precursor ◽  
X Ray Diffraction ◽  
Inverse Spinel ◽  
Precursor Method ◽  
X Ray

Zn7Sb2O12 is known to adopt an inverse spinel crystal structure, in which Zn2+ occupies the eight tetrahedral positions and Sb5+ and Zn2+ randomly occupy the 16 octahedral positions. Samples of Zn7−xNixSb2O12 (x=0, 1, 2, 3, and 4) were synthesized using a modified polymeric precursor method, known as the Pechini method. The crystal structure of the powders was characterized by Rietveld refinement with X-ray diffraction data. The results show that for x=0, 1, and 2 Ni substitutes for Zn2+ in the octahedral sites, and that for x=3 and 4 it is assumed that Ni2+ replaces Zn2+ ions in both the octahedral and tetrahedral positions. It is also observed for x=3 and 4 the formation of two spinel phases.

scholarly journals Microstructural, structural and optical properties of nanoparticles of PbO-CrO3 pigment synthesized by a soft route

Cerâmica ◽  
2015 ◽  
Vol 61 (357) ◽  
pp. 118-125 ◽  
Author(s):  
V. D. Araújo ◽  
M. R. B. Andreeta ◽  
L. J. Q. Maia ◽  
R. M. Nascimento ◽  
F. V. Motta ◽  
...  
Keyword(s):  
Optical Properties ◽  
Diffuse Reflectance ◽  
Microstructural Properties ◽  
Polymeric Precursor ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
Precursor Method ◽  
X Ray ◽  
Diffraction Patterns ◽  
Good Agreement

PbCrO4 and Pb2CrO5 particles were synthesized by the polymeric precursor method. Structural and microstructural properties of the particles were characterized by scanning electron microscopy with field emission gun, X-ray diffraction, and Raman spectroscopy techniques. The diffuse reflectance technique was employed to study the optical properties in the 400-700 nm range. The optical bandgap of the samples was obtained indirectly. Colorimetric coordinates L*, a*, b* were calculated for the pigment powders as a function of the heat treatment (400-700 ºC). The powders displayed colors ranging from green to red. X-ray diffraction patterns showed the presence of monoclinic PbCrO4 phase in green samples, while red powders had a monoclinic Pb2CrO5 phase structure. The Raman spectra of the PbCrO4 and Pb2CrO5 powders were in good agreement with those reported in the literature. The synthesized compounds can be used as green and red pigments with high thermal stability.

scholarly journals Dielectric Spectroscopy Analyses of SrBi4Ti4O15Films Obtained from Soft Chemical Solution

2009 ◽  
Vol 2009 ◽  
pp. 1-6 ◽  
Author(s):  
A. Z. Simões ◽  
C. S. Riccardi
Keyword(s):  
Thin Film ◽  
Dielectric Spectroscopy ◽  
Remanent Polarization ◽  
Ferroelectric Material ◽  
Polymeric Precursor ◽  
X Ray Diffraction ◽  
Precursor Method ◽  
X Ray ◽  
Dielectric Performance ◽  
Capacitance Voltage

SrBi4Ti4O15(SBTi) thin films were deposited by the polymeric precursor method on Pt bottom electrodes. The obtained films were characterized by X-ray diffraction, scanning electron microscopy, Raman spectroscopy, and dielectric spectroscopy analyses. The capacitance-voltage (C-V) characteristics of perovskite thin film showed normal ferroelectric behavior. The remanent polarization and coercive fields were 5.4 μC/cm2and 85 kV/cm, respectively. Dielectric spectroscopy was employed to examine the polycrystalline behavior of ferroelectric material and the mechanisms responsible for the dielectric performance of the thin film.

Synthesis, crystal structure, luminescence, and photocatalytic properties of a 2D Cu(II) metal-organic frameworks based on 3,5-di(1H-benzimidazol-1-yl)pyridine and 4,4′-oxybis(benzoate) ligands

2020 ◽  
Vol 75 (8) ◽  
pp. 727-732
Author(s):  
Chen Zhang ◽  
Jian-Qing Tao
Keyword(s):  
Crystal Structure ◽  
Thermal Analysis ◽  
Uv Light ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
X Ray Diffraction ◽  
X Ray ◽  
Uv Light Irradiation ◽  
Photocatalytic Activities ◽  
Metal Organic

AbstractA new Cu(II) metal-organic framework, [Cu(L)(OBA)·H2O]n (1) [H2OBA = 4,4′-oxybis(benzoic acid), L = 3,5-di(1H-benzimidazol-1-yl)pyridine] was hydrothermally synthesized and characterized through IR spectroscopy, elemental and thermal analysis and single-crystal X-ray diffraction. Complex 1 is a four-connected uni-nodal 2D net with a (44·62) topology which shows an emission centered at λ ∼393 nm upon excitation at λ = 245 nm. Moreover, complex 1 possesses high photocatalytic activities for the decomposition of Rhodamine B (RhB) under UV light irradiation.

X-ray Diffraction Analysis of Hexagonal Klockmannite CuSe Nanoparticles for Photodetectors under UV Light

2021 ◽  
Vol 125 (6) ◽  
pp. 3517-3526
Author(s):  
Kunjal Patel ◽  
G. K. Solanki ◽  
K. D. Patel ◽  
V. M. Pathak
Keyword(s):  
Diffraction Analysis ◽  
Uv Light ◽  
X Ray Diffraction ◽  
X Ray

Photocatalytic Activity of Fe-Doped ZnO/Montmorillonite Nanocomposite for Degradation of Malachite Green

2015 ◽  
Vol 827 ◽  
pp. 19-24 ◽  
Author(s):  
Nur Afifah ◽  
Nadia Febiana Djaja ◽  
Rosari Saleh
Keyword(s):  
Photocatalytic Activity ◽  
Malachite Green ◽  
Organic Dyes ◽  
Uv Light ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Spin Resonance ◽  
Doped Zno ◽  
Co Precipitation

In this study, the photocatalytic activity of pure Fe- doped ZnO and Fe- doped ZnO/Montmorillonite nanocomposite has been investigated for the degradation of malachite green under UV light irradiation. Both photocatalysts were synthesized using co-precipitation method and characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, Fourier-transform infrared absorption, and electron spin resonance. The results showed that the photocatalytic efficiency is better in the presence of montmorillonite compared to pure Fe- doped ZnO. To detect the possible reactive species involved in degradation of organic dyes control experiments with introducing scavengers into the solution of organic dyes were carried out. It is found that electron plays an important role in the degradation of malachite green.

ROOM TEMPERATURE PHOTOLUMINESCENCE OF POLYCRYSTALLINE SIC PREPARED FROM CARBON-SATURATED SI MELT

2002 ◽  
Vol 16 (06n07) ◽  
pp. 1047-1051
Author(s):  
JIANPING MA ◽  
ZHIMING CHEN ◽  
GANG LU ◽  
MINGBIN YU ◽  
LIANMAO HANG ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Room Temperature ◽  
Uv Light ◽  
X Ray Diffraction ◽  
X Ray ◽  
Room Temperature Photoluminescence ◽  
Composition And Structure ◽  
Light Excitation ◽  
Scanning Electron

Intense photoluminescence (PL) has been observed at room temperature from the polycrystalline SiC samples prepared from carbon-saturated Si melt at a temperature ranging from 1500 to 1650°C. Composition and structure of the samples have been confirmed by means of X-ray photoelectron spectroscopy, X-ray diffraction and scanning electron microscopy. PL measurements with 325 nm UV light excitation revealed that the room temperature PL spectrum of the samples consists of 3 luminescent bands, the peak energies of which are 2.38 eV, 2.77 eV and 3.06 eV, respectively. The 2.38 eV band is much stronger than the others. It is suggested that some extrinsic PL mechanisms associated with defect or interface states would be responsible to the intensive PL observed at room temperature.

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